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20 Cards in this Set
- Front
- Back
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Inductance has what effect, if any, on a change in (a) current, and (b) voltage
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(a) Opposes it
(b) No effect |
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Voltage leads current in what type of circuits
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Inductive
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Opposition to the flow of current by a coil in an AC circuit is represented by what symbol
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L
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What is the opposition offered by a coil to (a) the flow of alternating current and (b) a change in current
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(a) Resistance
(b) Inductance |
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The formula 2(3.14)fL is used to determine what electrical quantity
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Inductive reactance
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A capacitor will (a) conduct what type of current, and (b) block what type of current
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(a) All AC
(b) DC |
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Increases with an increase in frequency
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Inductive reactance
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Causes current to lead voltage by 90 degrees
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Capacitive reactance
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Decreases with an increase in frequency
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Capacitive reactance
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Causes a phase shift between voltage and current
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Inductive reactance
Capacitive reactance |
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Opposition to AC but not DC
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Resistance
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What formula would you use to determine the total reactance for the circuit
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X=XL-XC
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What term is used to express the total opposition to ac in an electrical circuit
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Impedance
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True power in a circuit is dissipated in what circuit element
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Capacitance
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In a purely reactive circuit, what happens to power
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It is returned to the source
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True power is measured in what unit
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Watt
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What is the unit of measurement for reactive power
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Watt
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Apparent power in an AC circuit is a combination of which of the following factors
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Reactive power and true power
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What is the unit of measurement for apparent power
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Watt
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The portion of apparent power dissipated in an ac circuit can be calculated by what formula
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PF = (Ir)^2R/(Iz)^2Z
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